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Brake Failure Light-2004 R1150RTP

2004 R1150RTP. Thrice in the past two days, during or just following a stop, I had the warning (bulb) triangle and the brake failure lights come on. The triangle would go out almost immediately. The brake failure light would flash for about 5 seconds, then go out. No noticeable difference in braking. Thoughts?

Based on multimeter readings and remote guidance, replaced the batt. Odyssey PC680 or whatever it was was not a direct fit. Took a while and some bracket modifications. No worries for a day. Then today, after the highway commute with no problems, same symptoms upon arrival. Coasting into parking garage at idle, iabs applied, brake fail light flashing and servo fade until I increased revs. No probs starting upon leaving, and keeping revs at no less than 1800 all the way home, even at stops, no further problems. Thoughts?

My mechanic says "the manual" has simple diagnostic tests I can do with a multimeter to isolate which part/system is malfunctioning. I'm trying to diagnose prior to taking it in so parts can be on hand beforehand. It's a little over my head, but I think I can figure it out with the right reference guide. I rode 85 miles round trip yesterday, avoiding anything below 2K as much as possible (at lights, etc.) and had no issues. So I'm generating power, just not an adequate amount at idle. If I were constantly running a deficit, I think I'd have experienced battery failure over the past week.